ISL54065EVAL1Z User Guide
Contents
1. gt n Je 9 4 4 0 v 10UF 2 Ho a 1 rp TPL ES RA Ny gt O 9 10 Y Vv a 8 e 4 ele i gt N o TP9 TS 48 E J sl IN y 1 QUF Pia a DA Y Ni ee p 11 O 4 122UF 2 E 2 1 g SE 1 Ul El 0 2 v z s 3 y 3 UTOFNI2 TPS vono ae A ipi pA at a4 1 er xy to O EN 1 8UF 4 Y c8 7 N 2 11 Lens v7 N y 2925 17 LQQUF a Inks 318 93 JP3 1 57 Ly 2 o O 28 V ipia k JPL we 197 Vv coma o o Tel d 0 Bo i aw i f nso Si a a N rs s1_3 23 3 118 m 2 osx Bsq d E ESA gn 4 4 Y day OLEL AION uone2. occur in the speaker generating a Click and Pop noise For proper operation of Click and Pop elimination the switch terminal that is being connected to the speaker should be connected through the shunt resistor before connecting to the load This allows any transients generated by the source to be discharged through the shunt resistor first eliminating any audible click and pop noises With a typical DC blocking capacitor of 200uF and the shunt resistance having a typical value of 140Q allowing a 250ms dead time in for discharging a transient will eliminate the click and pop noise Applications The ISL54065 is designed to be a Dual SPDT switch for multiplexing or switching of signals that require low insertion loss low power consumption and negative voltage swing capability Such applications include Audio Video equipment battery or portable devices and medical equipment In addition the Click and Pop Elimination Circuitry makes it ideal for portable audio such as MP3 players and cell phones 3 intersil AN1370 0 February 3 2009 Application Note 1370 Using The Board Refer to Figure 2 3 Connect the Audio Signal Oscilloscope to the COMx BNC outputs Lab Equipment 4 Connect the Logic Control generator to the INx logic The equipment external supplies and signal sources inputs needed to operate the board are listed below 5 Set the EN pin to logic HIGH to have the switches 1 1 8V to 6 5V DC Power Supply
3. 8V TO 6 5V AUDIO SIGNAL OSCILLOSCOPE AUDIO SOURCE SIGNAL LEFT RIGHT C4 RI Vgc GN eo Tn e ii 110 S l 0 C3 TP3 a u e J1 J2 JP1 Ci m RT oom CS pe TPL TP eo on D 2m Up mua be e TP4 JP R5 R rel eon ma ol Ph e e CB Ra o TPB TP10 o to Pa Pa PIO APA LOGIC CONTROL jam Moo Mee Boo Boo e Mm E P INI IN2 C TPS JT e a sa le ln 2 O oo C10 Ra EN INI IN2 NO2 eo Hi to Te o aeree e 00 0 T ISL54065ENG1Z KN REV A Y _ ntersil 1 888 INTERSIL FIGURE 2 BASIC EVALUATION TEST SETUP BLOCK DIAGRAM Note If the CP is logic HIGH and EN is logic LOW the NCx and the NOx switch terminals will have the Click and Pop Elimination Circuitry active Under this scenario both switch terminals with have a shunt resistor to ground CLICK AND POP OPERATION Single supply audio sources are biased at a DC offset that generates transients during power ON OFF of the audio source This DC offset is coupled through a blocking capacitor that is needed to remove the DC bias to the speaker causing a transient voltage at the load For example when the source is OFF and suddenly turned ON with a DC offset the capacitor will develop a voltage equal to the DC offset If the ISL54065 does not have the Click and Pop Elimination Circuitry active a transient discharge will
4. evaluation board contains a 10uF bulk capacitor and a 0 1uF high frequency decoupling capacitor at the supply lines Logic Control The evaluation board contains two types of logic control to the digital logic inputs of the ISL54065 IC available to the user The logic pins can be controlled either through manual or external operation The logic control pins are manually toggled by the SPST switches mounted on the evaluation board S1 S3 When the switch is in the up position H the associated logic pin is pulled to Vcc for logic HIGH When the switch is in the down position L the associated logic pin is pulled to GND for logic LOW For manual operation the jumpers JP5 JP8 need to be in the 1 2 position Note When JP6 is in the 1 2 position the CP pin is automatically logic HIGH For external control via a function generator or switched source set the jumpers JP5 JP8 in the 2 3 position This 1 CAUTION These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures 1 888 INTERSIL or 1 888 468 3774 Intersil and design is a registered trademark of Intersil Americas Inc Copyright Intersil Americas Inc 2009 All Rights Reserved All other trademarks mentioned are the property of their respective owners Application Note 1370 by passes the SPST switches and routes the logic control to the BNC connectors J11 J14 located on the right side of the board Note S2 and S3 have a 3 9MQ pull down
5. operating above 3 3V supply refer to the datasheet for appropriate logic levels to drive the logic pins It is always recommended to drive the logic pins to the positive supply rail Vcc and GND to minimize power consumption Logic States INPUT SELECT INX PINS If the INx Pins are logic HIGH then the NOx switches are turned ON and the NCx switches are turned OFF If the INx Pins are logic LOW then the NCx switches are turned ON and the NCx switches are turned OFF ENABLE EN PIN Ifthe EN Pin is logic HIGH the switches are active and their logic state dependent on the INx pins If the EN Pin is logic LOW both COMx terminals are turned OFF from the NCx and NOx switch terminals The part is disabled and no signals will pass through the switch CLICK AND POP CP PIN If the CP Pin is logic HIGH shunt resistors are activated on the NOx and NCx terminals to ground when the switch is OFF For example if INx is logic HIGH the NCx switches are turned OFF There will be a shunt resistance from the NCx to ground The value of this resistor is dependent on supply voltage but is typically 1400 with a 3 3V supply Driving the CP pin logic LOW will deactivate the Click and Pop Elimination Circuitry and there will be no active shunt resistors on the switch terminals when a switch is turned OFF 2 intersil AN1370 0 February 3 2009 Application Note 1370 DC POWER SUPPLY 1
6. performance The evaluation board has selectable output loads of 20kQ and 32M resistors to simulate an audio amplifier pre amp or stereo headphones The board also has DC blocking capacitors at the switch input to remove the DC bias of single supply amplifiers This application note will guide the user through the process of configuring and using the evaluation board to evaluate the ISL54065 device Key Features e Selectable Output Resistive Loads and Input DC Blocking Capacitors RCA Audio Input Output Jacks Stereo Headphone Output Jack and BNC Connectors e Convenient Test Points and Connections for Test Equipment e Click and Pop Elimination Circuitry e Manual or External Logic Input Control ISL54065EVAL1Z Evaluation Board User s Manual AN1370 0 February 3 2009 Picture of Evaluation Board Top View FIGURE 1 ISL54065EVAL1Z EVALUATION BOARD Board Architecture Layout Basic Layout of Evaluation Board A picture of the evaluation board is located in Figure 1 The ISL54065 IC is soldered onto a 12 Ld wide DIP header board The DIP header board is mounted to the center of the evaluation board The evaluation board integrates the necessary connections and components to interface with the ISL54065 for ease of operation Power Supply The ISL54065 IC requires a supply voltage in the range of 1 8V to 6 5V for proper operation Banana jacks for Vcc J1 and GND J2 are located at the top of the board The
7. ace 2 Audio Signal Generator NCx Switches Active 3 Audio Signal Oscilloscope 1 Drive the INx pins to logic LOW 4 Logic Control Generator and or Pulse Generator 2 The NCx switches are now connected to the COMx tye terminals Initial Board Setup Procedure 3 The NOx switches have shunt resistors on the terminals 1 Attach the evaluation board to the DC power supply at J1 to ground VCC and J2 GND Positive terminal at J1 and negative terminal at J2 The supply should be capable of delivering NOx Switches Active 1 8V to 6 5V and 100A of current 1 Drive the INx pins to logic HIGH 2 Connect the Audio Source Signal to the NOx or NCx BNC 2 The NOx switches are now connected to the COMx inputs The analog input voltage range can be from terminals Nog Sou up to VCC 3 The NCx switches have shunt resistors on the terminals to ground Intersil Corporation reserves the right to make changes in circuit design software and or specifications at any time without notice Accordingly the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding For information regarding Intersil Corporation and its products see www intersil com 4 intersil AN1370 0 February 3 2009 6002 reniqoy O OZELNV 1S193u1 ISL54065EVAL1Z Evaluation Board Schematic 3ND U
8. acitor it is recommended to bypass the capacitors C3 C10 by placing jumpers on JP1 JP4 The capacitance can be reduced to 100uF by depopulating the OQ resistor on R1 R4 The audio outputs COM1 and COM2 have selectable output loads on the evaluation board Jumpers JP9 and JP10 configure the output load resistance When the jumpers are in the 1 2 position the load impedance is 32Q When the jumpers are in the 2 3 position the load impedance is 20k If the user decides to have no load impedance on the evaluation board simply remove the jumpers Power Supply The DC power supply connected at banana jacks J1 VCC and J2 GND provides power to the evaluation board The evaluation board requires a 1 8V to 6 5V DC power supply for proper operation The power supply should be capable of delivering 100A of current Logic Control The state of the ISL54065 device is determined by the Truth Table as defined in the ISL54065 datasheet When in manual operation mode the logic being toggled by the SPST switches S1 S3 will always drive the voltage of the logic pin to Vcc for a HIGH and GND for a LOW In external control mode the voltages being driven by an external source must meet appropriate V y and Vj levels as defined in the datasheet The control pins are 1 8V logic compatible up to a 3 3V supply which allows for control via a standard ucontroller Logic 0 LOW when lt 0 5V Logic 1 HIGH when gt 1 4V When
9. intersil Application Note Description The ISL54065EVAL1Z evaluation board is designed to provide a quick and easy method for evaluating the ISL54065 IC The ISL54065 IC is a single supply Dual Single Pole Double Throw SPDT analog switch with negative swing capability sub Q ON resistance and low power dissipation The ISL54065 is designed for applications that require an analog switch that may see voltages below ground at the switch terminals such as audio and video The ISL54065EVAL1Z evaluation board is developed to evaluate the ISL54065 IC integrating many features for ease of use in examining the performance of the device under various operating conditions To help understand the operation of the ISL54065 IC and the ISL54065EVAL1Z evaluation board it is recommended to study the Evaluation Board Schematic on page 5 of this application note and refer to the datasheet for the ISL54065 IC The ISL54065 IC is a dual SPDT analog switch that is capable of swinging down to 6 5V below the positive supply rail For example if the supply is at 1 8V the switch terminal analog operating range is from 4 3V to 1 8V The ISL54065 also integrates Click and Pop Elimination Circuitry to remove transient noises at the speaker during power ON OFF of an audio system The evaluation board contains standard RCA BNC connectors and a single headphone jack to allow the user to easily interface with the IC to evaluate its functions features and
10. resistor hard wired from the INx pin to GND These resistors do not appear on the ISL54065EVAL1Z Board Schematic on page 5 Switch Terminals The evaluation board contains components to interface with all six terminals of the Dual SPDT switch The common COM terminals of the switch are located in the upper right section of the evaluation board The Normally Open NO and Normally Closed NC terminals of the switch are located on the left side of the evaluation board All switch terminals include both RCA jacks and BNC connectors The COM terminals also include a headphone jack HJ1 for connecting a stereo headphone or line level plug Refer to Table 1 for a list of the pins on the ISL54065 IC and the associated components on the evaluation board The evaluation board also includes Test Points for convenient locations to probe specific pins on the IC TABLE 1 BOARD COMPONENT TABLE EVALUATION BOARD ISL54065 PIN CONNECTION TEST POINT VCC J1 TP1 GND J2 TP2 EN S1 J11 TP7 CP J12 TP8 IN1 S2 J13 TP9 IN2 S3 J14 TP10 NO1 J3 J4 TP3 NC1 J5 J6 TP4 COM1 J15 J16 HJ1 TP11 NO2 J9 J10 TP6 NC2 J7 J8 TPS COM2 J17 J18 HJ1 TP12 Note The audio inputs NCx and NOx have a 200uF series DC blocking capacitance that can be used for AC coupling audio signals that are DC biased in single supply systems If the audio source is not DC biased or if the audio source already has a DC blocking cap
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